DESIGN, DEVELOPMENT AND EVALUATION OF ANIMAL OPERATED ROTARY SYSTEM

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Date
2019
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Orissa University of Agriculture and Technology, Bhubaneswar
Abstract
In Odisha, 83.8 per cent of the farmers are under small and marginal categories and mostly depend on animal power for different agricultural operations such as tillage, transportation etc. There is a need for these categories of farmers to utilize the animal power in rotary mode to operate the post harvest gadgets to increase the annual use so that the burden of maintenance cost is reduced. The existing double stage rotary gear transmission system was evaluated to study its mechanical transmission efficiency and further for paddy threshing by a hold on type paddy thresher considering three different working radii of 3.0, 3.4 and 3.8 m. A new customized prony brake dynamometer was developed to study the mechanical transmission efficiency of the rotary system. A new single stage rotary gear transmission system was conceptualized and designed with overall gear ratio of 1:145.6 for achieving higher mechanical transmission efficiency apart from higher speed and low torque. The new single stage rotary gear transmission system consists of four spur gear system and one bevel gear system which were designed theoretically against static failure, dynamic failure and wear failure. A 3-D model of the new rotary gear system was developed in SolidWorks software and was imported to ANSYS Workbench software where the FEA study of stress analysis was conducted to assess the safety of design. The predicted values of maximum equivalent (von-Mises) stress and maximum principal stress from FEA study were validated with respect to bending and failure against yield stress. The prototype of the new single stage rotary transmission system was fabricated in a SSI Unit and was installed in CAET Campus. Performance evaluation of the same conducted for paddy threshing by the same hold on type paddy thresher with respect to mechanical transmission efficiency, rotary system parameters, physiological parameters of working bullocks and machine parameters considering the same three working radii as was done for the existing rotary system. The results on performance evaluation of the new system were found significantly better with working radius of 3.8 m. The results on mechanical transmission efficiency, mean draft requirement, mean thresher shaft speed, fatigue score, output capacity and threshing efficiency were observed as 74.85 percent, 382.22 N, 459.16 rpm, 5.00, 147.45 kgh-1 and 97.14 per cent respectively. The performance of the new single stage rotary system was found superior to the existing rotary system considering the above mentioned parameters. The cost of operation of the new single stage rotary gear transmission system for paddy threshing by the hold on type thresher was calculated as Rs 57.20 q-1 compared to Rs 58.10 q-1following straight line method.
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Th-5624
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